/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.SampleElements.Chars;

import java.util.List;

/**
 * Generates {@code List<Character>} instances for test suites.
 *
 * @author Kevin Bourrillion
 * @author Louis Wasserman
 */
@GwtCompatible
public abstract class TestCharacterListGenerator implements TestListGenerator<Character>
{
    @Override
    public SampleElements<Character> samples()
    {
        return new Chars();
    }

    @Override
    public List<Character> create(Object... elements)
    {
        Character[] array = new Character[elements.length];
        int i = 0;
        for (Object e : elements)
        {
            array[i++] = (Character) e;
        }
        return create(array);
    }

    /**
     * Creates a new collection containing the given elements; implement this method instead of {@link
     * #create(Object...)}.
     */
    protected abstract List<Character> create(Character[] elements);

    @Override
    public Character[] createArray(int length)
    {
        return new Character[length];
    }

    /**
     * Returns the original element list, unchanged.
     */
    @Override
    public List<Character> order(List<Character> insertionOrder)
    {
        return insertionOrder;
    }
}
